Are labor rights determined based on a contract that violates the Labor Law, or based on the Saudi Labor Office Law?

The reference for the employee and their employer is the employment contract concluded between them, whether written or verbal, based on the Almighty's saying: "O you who have believed, fulfill [your] contracts," and the Prophet's (peace be upon him) saying: "Muslims are bound by their conditions." Thus, the employee's rights are based on the contract, not on labor office law, because custom is not considered if the contract explicitly states otherwise.